class_docstr: Add 3 to every category.
code: def fit(self, X, y=None):
      self._convert_and_check_X(X)
      return self
  
file_path: auto-sklearn/autosklearn/pipeline/implementations/CategoryShift.py
imports: import numpy
  from scipy import sparse
  from sklearn.base import BaseEstimator, TransformerMixin
  from sklearn.utils import check_array
label_desc: Use image node_id 3 for calling the CategoryShift obj's underlying member method code with example usage: obj.fit(X, y) and returns: self